GCC 13 fixes.

PiPedalCommon/src/include/HtmlHelper.hpp

@@ -20,6 +20,7 @@
 #pragma once
 
 #include <string>
+#include <cstdint>
 
 namespace pipedal {
 

docs/BuildPrerequisites.md

@@ -46,8 +46,7 @@ In the project root, run the following commands to initialze and update pipedal
 must be performed even if you used Visual Studio Code to initially install the project.
 
     cd ~/src/pipedal
-    git submodule init
+    git submodule update --init --recursive
-    git submodule update
    
 Run the following command to install and configure React dependencies.